Dense medium cyclones separate particles based on their density due to centrifugal force induced by the swirling flow. They are usually used in the coal industry to separate lighter coal from denser ash, but can be used for other raw materials, such as lead-zinc ore. There are several methodologies used to select and calculate DM cyclones. This paper deals with two methods related to the selection and calculation of DM cyclone capacity on the example of lead-zinc ore preconcentration.